7 free browser-based tools to format, validate and convert JSON, CSV, XML and Base64 data - all processing happens locally.
Format and pretty-print JSON data with syntax highlighting.
Validate JSON syntax and identify errors instantly.
Convert JSON arrays to CSV spreadsheet format.
Convert CSV data to structured JSON format.
Format and indent XML documents for readability.
Encode text or file data to Base64 format.
Decode Base64 strings back to readable text or binary data.
Common questions about JSON, CSV, XML formatting and Base64 encoding.
JSON formatting (pretty-printing) adds whitespace and indentation to make JSON readable - it does not check for errors. JSON validation checks whether the JSON follows valid syntax rules. You can format invalid JSON and get a readable but still broken result. Use the validator to confirm your JSON is syntactically correct.
JSON to CSV conversion works best when the JSON is an array of objects with consistent keys. Nested objects and arrays may be flattened or omitted depending on the conversion logic. Complex nested JSON structures may not convert cleanly to a flat CSV table.
No. Base64 is an encoding scheme, not encryption. It converts binary data to a printable text format using 64 characters. Anyone can decode Base64 without a key. Do not use Base64 to protect sensitive data - use proper encryption for that.
XML formatting adds consistent indentation and line breaks to XML documents, making them easier to read and debug. Minified or machine-generated XML is often on a single line. The formatter restructures it into a readable hierarchy without changing the data.
No. All developer tools process data locally in your browser. Your text or file content is not sent to NEXDOWNLOAD servers. The tools use browser JavaScript to parse, format and convert data on your device.
The Base64 tools use standard Base64 encoding as defined in RFC 4648. Text input is encoded as UTF-8 before Base64 encoding. The decoder reverses this process. URL-safe Base64 variants (using - and _ instead of + and /) may not be supported.
Tool reference
Developer tools format, validate, encode and convert JSON, CSV, XML and Base64 data. Syntax cleanup is useful for debugging, but it does not replace application-specific schema or business-rule validation.
Format and pretty-print JSON data with syntax highlighting. Use it when you need working with structured text or encoded data without sending the input to a remote conversion service. Parse the result again after formatting and compare important values. Formatting cannot infer what malformed JSON was supposed to mean, so syntax errors should be corrected explicitly.
Validate JSON syntax and identify errors instantly. Use it when you need working with structured text or encoded data without sending the input to a remote conversion service. Use the reported position to correct commas, quotes, brackets or invalid literals. Then test the payload in the actual API or application that will consume it.
Convert JSON arrays to CSV spreadsheet format. Use it when you need working with structured text or encoded data without sending the input to a remote conversion service. Inspect headers, delimiters, quoted commas, line breaks, null values and numeric-looking identifiers such as ZIP codes. Open the result in the destination spreadsheet or data tool before deleting the source.
Convert CSV data to structured JSON format. Use it when you need working with structured text or encoded data without sending the input to a remote conversion service. Inspect headers, delimiters, quoted commas, line breaks, null values and numeric-looking identifiers such as ZIP codes. Open the result in the destination spreadsheet or data tool before deleting the source.
Format and indent XML documents for readability. Use it when you need working with structured text or encoded data without sending the input to a remote conversion service. Confirm opening and closing tags, namespaces, declarations and escaped characters. If a target system requires an XSD, validate against that schema separately.
Encode text or file data to Base64 format. Use it when you need working with structured text or encoded data without sending the input to a remote conversion service. Confirm the expected character encoding or binary file type after decoding. Do not paste passwords or secrets into Base64 tools under the assumption that the result becomes private.
Decode Base64 strings back to readable text or binary data. Use it when you need working with structured text or encoded data without sending the input to a remote conversion service. Confirm the expected character encoding or binary file type after decoding. Do not paste passwords or secrets into Base64 tools under the assumption that the result becomes private.
Complete category reference
Structured-data workflows depend on exact syntax, encoding, delimiters and data shape. Formatting, validation and conversion are different operations. A readable result should still be parsed or imported by the real destination.
Format and pretty-print JSON data with syntax highlighting.
Use it when you need working with structured text or encoded data without sending the input to a remote conversion service. Formatting changes whitespace and indentation, while minification removes unnecessary whitespace. It should not intentionally change keys, values or array order in valid JSON.
Before you finish, Parse the result again after formatting and compare important values. Formatting cannot infer what malformed JSON was supposed to mean, so syntax errors should be corrected explicitly.
Validate JSON syntax and identify errors instantly.
Use it when you need working with structured text or encoded data without sending the input to a remote conversion service. Validation checks JSON syntax. It is not the same as validating against a JSON Schema or checking business rules such as required fields and allowed value ranges.
Before you finish, Use the reported position to correct commas, quotes, brackets or invalid literals. Then test the payload in the actual API or application that will consume it.
Convert JSON arrays to CSV spreadsheet format.
Use it when you need working with structured text or encoded data without sending the input to a remote conversion service. Conversion maps rows and columns to JSON objects or flattens suitable JSON into tabular CSV. Nested arrays and objects may need an explicit flattening strategy because CSV has no native nested structure.
Before you finish, Inspect headers, delimiters, quoted commas, line breaks, null values and numeric-looking identifiers such as ZIP codes. Open the result in the destination spreadsheet or data tool before deleting the source.
Convert CSV data to structured JSON format.
Use it when you need working with structured text or encoded data without sending the input to a remote conversion service. Conversion maps rows and columns to JSON objects or flattens suitable JSON into tabular CSV. Nested arrays and objects may need an explicit flattening strategy because CSV has no native nested structure.
Before you finish, Inspect headers, delimiters, quoted commas, line breaks, null values and numeric-looking identifiers such as ZIP codes. Open the result in the destination spreadsheet or data tool before deleting the source.
Format and indent XML documents for readability.
Use it when you need working with structured text or encoded data without sending the input to a remote conversion service. Formatting adjusts whitespace and indentation around XML markup. Well-formed XML is not automatically valid against a specific XSD or application schema.
Before you finish, Confirm opening and closing tags, namespaces, declarations and escaped characters. If a target system requires an XSD, validate against that schema separately.
Encode text or file data to Base64 format.
Use it when you need working with structured text or encoded data without sending the input to a remote conversion service. Base64 converts bytes into a text representation or reverses that encoding. It is encoding, not encryption, and it normally increases the size of binary data compared with the original bytes.
Before you finish, Confirm the expected character encoding or binary file type after decoding. Do not paste passwords or secrets into Base64 tools under the assumption that the result becomes private.
Decode Base64 strings back to readable text or binary data.
Use it when you need working with structured text or encoded data without sending the input to a remote conversion service. Base64 converts bytes into a text representation or reverses that encoding. It is encoding, not encryption, and it normally increases the size of binary data compared with the original bytes.
Before you finish, Confirm the expected character encoding or binary file type after decoding. Do not paste passwords or secrets into Base64 tools under the assumption that the result becomes private.